Moog D688-47 Série Manuel De L'utilisateur page 3

3 Installation
Compare model number and type with that specified on hy-
draulic schematic. The valve can be mounted in any position,
fixed or movable.
Mounting surface:
(< 0.01 mm (0.00004 in) over 100 mm (3.94 in)) and finish
(R < 0.8 µm). Care must be taken to ensure that contamina-
a
tion does not enter the hydraulic system, all work areas must
be clean of surface or air-borne contamination.
Mounting: Socket head screws (grade 10.9) according to
EN ISO 4762, torque from inside to outside diagonally alternat-
ing.
Pattern to
Series ISO 4401
D688 08-08-0-05
4 Pilot Mode and Maximum Pressures
Pilot mode: Pay attention to the hydraulic connection scheme
and to the mounting pattern of the hydraulic manifold. Pay at-
tention to the hydraulic schematic on the valve nameplate and
to the type designation defining the pilot mode.
Maximum pilot and operating pressure (p
plate.
5 Electrical Connection
Electrical safety: The protective conductor connection is con-
nected to the electronics housing or valve body. The insulation
materials employed are designed for use in the safety extra-
low voltage range.
To comply with safety regulations requires isolation from the
mains according to EN 61558-1 and EN 61558-2-6 and limiting
all voltages according to EN 60204-1. We recommend using
SELV/PELV power supplies.
Rated signal: See nameplate.
External fuse per valve: 1.0 A time lag
Valve phasing: A positive signal (4–10) causes valve opening
PA.
Connector wiring: See wiring schematic in AM 474E.
Connection: Signal lines shielded, shielding connected at
both ends and additionally connected to reference potential
(0 V) at the control side (to improve EMC). Connect the protec-
tive conductor.
Observe technical note TN 353.
6 Hydraulic System Start Up
Pay attention to the pressure setting, the venting instructions,
the fail-safe functions and the alarm messages!
7 Null Adjustment
WARNING
Unsafe state of the machine due to wrong posi-
tion of the valve's spool.
A wrong position of the valve's spool may result in
undefined sequences of motion.
 The null position must not be altered.
Remove the locking screw with sealing ring from the cover of
the electronics housing to access the null adjustment potenti-
ometer. Turning the potentiometer shaft results in a spool posi-
tion change. Turning clockwise will increase valve opening
PA. The output signal for actual spool position will also
change. After adjustment refit the sealing ring and the locking
screw.
Page 2/2
Check for flatness
Socket Torque
head screw Pcs. [Nm]
M12 x 45 6
, p ): See name-
X P
8 Service
Replacing O rings: The mounting surface O rings may be re-
placed by the customer (on the pilot valves and the way valves
as well). Pay attention to cleanliness of the valve and of the
surroundings.
Transportation: Before transporting a valve the valve ports
have to be sealed with a clean shipping plate or adhesive tape.
Package the valve carefully to prevent damage during trans-
portation.
Repairs: Repairs may only be carried out by us or by our au-
thorized service centers.
9 Disposal
It is essential to comply with the relevant national waste dis-
posal regulations and environmental protection provisions
94
when disposing of valves, spare parts or accessories, packag-
ing that is no longer needed, hydraulic fluid or auxiliary materi-
als and substances used for cleaning!
Mounting and Installation Notes D688-47XX (B97072-688-001; Version E, 07/13)